2018-10-24

简单的轮播图

QQ图片20181025201015.jpg

html代码

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css代码
{
padding: 0;
margin: 0;
}
.head{
font-size: 50px;
color: #f40;
text-align: center;
background-image: url(img/head.png);
background-size: 100% 100%;
line-height: 180px;
}
.banner{
width: 1500px;
height: 700px;
overflow: hidden;
display: none;
position: relative;
background-repeat: no-repeat;
background-size: 100% 100%;
margin: 0 auto;
}
.SowMap{
height: 700px;
width: 1500px;
overflow: hidden;
display: block;
position: relative;
}
.main{
width: 1500px;
height: 700px;
margin: 0 auto;
}
.map-active{
display: block;
}
.map1{
background-image: url(img/01.jpg);
}
.map2{
background-image: url(img/02.jpg);
}
.map3{
background-image: url(img/03.jpg);
}
.button{
position: absolute;
width: 100px;
height: 100px;
top: 50%;
}
.button:hover{
background: url(img/button.jpg) no-repeat center center;
background-size: 100% 100%;
}
.right{
right: 210px;
}
.left{
transform: rotate(180deg); /旋转/
z-index: 2;
left: 510px;
}
.dog{
position: absolute;
right: 260px;
bottom: 80px;
text-align: right;
}
.dog span{
display: inline-block;
width: 20px;
height: 20px;
border-radius: 50%;
background: rgba(7,17,27,0.4);
line-height: 12px;
box-shadow: 0 0 0 2px rgba(255,255,255,0.8); /阴影*/
cursor: pointer;
}
.dog span.active{
box-shadow: 0 0 0 2px rgba(7,17,27,0.4);
background: #fff;
}

/介绍/
.beijing{
width: 300px;
height: 700px;
position: absolute;
background: rgba(7,17,27,0.1);
opacity: 0.1;
z-index: 1;
}
.introduce{
width: 300px;
height: 700px;
position: absolute;
background: rgba(7,17,27,0.5);
z-index: 2;
}
.introduce div{
color: white;
height: 60px;
line-height: 64px;
font-size: 20px;
text-align: center;
padding: 20px 0;
}
.introduce div:hover{
background-color: #6b6565;
cursor: pointer;

}
.jiesao1{
position: absolute;
background: rgba(7,17,27,0.5);
z-index: 2;
width: 400px;
height: 700px;
left: 300px;
top: 0px;
display: none;
}
.jiesao2{
position: absolute;
background: rgba(7,17,27,0.5);
z-index: 2;
width: 400px;
height: 600px;
left: 300px;
top: 100px;
display: none;
}
.jiesao3{
position: absolute;
background: rgba(7,17,27,0.5);
z-index: 2;
width: 400px;
height: 500px;
left: 300px;
top: 200px;
display: none;
}

js代码

function byId(id) {
return typeof(id) === "string"?document.getElementById(id):id; //判断id是否为字符串
}//封装一个代替getElementById()的方法

var index = 0,
timer = null, //定时器
pics = byId("SowMap").getElementsByTagName("div"),//取出SowMap下面的div
len = pics.length,
right = byId("right"),
left = byId("left"),
dog = byId("dog").getElementsByTagName('span'),
introduce = byId("jiesao").getElementsByTagName("div"),
jiesao = byId("jiesao").getElementsByTagName("span");
function slideImg(){
var main = byId("main");
//鼠标停止
main.onmouseover = function(){
if(timer){
clearInterval(timer);
}
}
//鼠标离开
main.onmouseout = function(){
timer = setInterval(function(){
console.log(index);
index++;
if(index>=len){
index = 0;
}
changeImg();
},3000); //每隔一段时间调用一次
}
main.onmouseout(); //自动播放图片
for(var i = 0;i dog[i].id = i; //给每个span添加一个id
introduce[i].id = i;
jiesao[i].id = i;
dog[i].onclick = function(){
index = this.id;
changeImg();
}
introduce[i].onmouseover = function(){
index = this.id;
for(var j=0;j jiesao[j].style.display="none";
}
jiesao[index].style.display="block";
changeImg();
} ////左侧指向
introduce[i].onmouseout = function(){
index = this.id;
for(var j=0;j jiesao[j].style.display="none";
}////鼠标移除删去介绍
}
}
}
left.onclick = function(){
index--;
if(index<0){
index = 2;
}
changeImg();
}
right.onclick = function(){
index++;
if(index>=len){
index = 0;
}
changeImg();
}
function changeImg(){
for(var i = 0;i pics[i].style.display ="none";
dog[i].className = "none";
}//遍历所有的图片
pics[index].style.display = "block";
dog[index].className = "active";
}//切换图片
slideImg();